<section>
	<h1 data-bind="text:displayName"></h1>
	<form role="form" class="form-inline">
		<div class="form-group">
			<input type="text" class="form-control" placeholder="姓名" data-bind="value:name,valueUpdate:'afterkeydown'"/>
		</div>
		<input type="button" class="btn btn-default" value="点我" data-bind="click:sayHello,enable:canSayHello"/>
		<input type="button" class="btn btn-default" value="清空" data-bind="click:clear,enable:canSayHello"/>
	</form>
</section>